U.S. stocks opened slightly higher on Wednesday as investors assumed a cautious posture ahead of the statement from the Federal Reserve's policy-setting meeting due to be released this afternoon. The S&P 500 opened 3 points, or 0.2%, higher at 2,097. The Nasdaq Composite added 12 points, or 0.2%, to 5,100. The Dow Jones Industrial Average began the day up 25 points, or 0.2%, at 17,658.
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